Route reliability record
BOS→CVG
Boston to Cincinnati
- Flights
- 1,943
- Period
- July 2025 to June 2026
- Distance
- 752 mi
- Carriers
- 3
This route lands a B, 3 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 1,943 BOS to CVG flights, with a median arrival 9 minutes early.
Best time to fly BOS to CVG: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 87.5% of the time and Tuesday flights 86.0%, against 80.5% for the route overall.
The US average over the same twelve months is 77.6%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.5%
Arrivals under 15 minutes late, of 1,883 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
2.88%
National rate is 1.81%
Best carrier
Republic
82.3% on time across 1,557 flights
These figures cover 1,943 flights between July 2025 and June 2026. The median arrival is 9 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Carrier by carrier
Which airline is most reliable on BOS to CVG
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Linesthin sample | 22 | 95.5% | 35 min | 0.00% | A+ |
| Republic Airways | 1,557 | 82.3% | 54 min | 3.08% | B− |
| Envoy Airthin sample | 364 | 71.8% | 77 min | 2.20% | C |
Flight by flight
Flights on BOS to CVG
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 22 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am100 flights87.4%
- 8am–11am388 flights87.5%
- 11am–2pm361 flights87.5%
- 2pm–5pm459 flights78.7%
- 5pm–8pm483 flights74.5%
- 8pm–5am152 flights65.5%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 87.5% of the time, against 65.5% for the overnight window. That is 22 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 483 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 16 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
December is the weak month at 74.4% on time, against 89.9% in August. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. October was the busiest month here, with 191 flights.
Across the week, Tuesday is the strongest day at 86.0% on time and Sunday the weakest at 74.0%. 12 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Late-arriving aircraft accounts for 51% of the 22,000 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 51%Late-arriving aircraft
- 26%Carrier
- 20%National Airspace System
- 2%Extreme weather
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 22,000 reported delay minutes here, that single category outweighs weather by 22 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 22,195 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 87.5% on time here.
Cancellations run at 2.88%, against 1.81% nationally. That is roughly one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here actually costs
7.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 752 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 80.1% on time across 1,942 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,943 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in CVG after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 2.88% cancellation rate. A late arrival costs you about an hour; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 1,883 completed flights over 12 months sit behind that.
Common questions
BOS to CVG questions
How often is BOS to CVG delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 19.5% of the 1,943 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.
How reliable is BOS to CVG compared with the rest of the country?
80.5% of flights arrive on time here against a national 77.6%, a difference of 3 points in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on BOS to CVG?
The 8am–11am departure window is the strongest at 87.5% on time. The 8pm–5am window is the weakest at 65.5%, 22 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are December delays on BOS to CVG?
December is the weakest month at 74.4% on time, compared with 89.9% in August. Across the year that is 16 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- CVG to BOS — the return legseparate record
- Boston Logan International (BOS) delay statistics
- Cincinnati/Northern Kentucky International (CVG) delay statistics
- Republic Airways on BOS to CVG82.3%
- Envoy Air on BOS to CVG71.8%
- BOS to DCA, a related route74.0%
- ORD to CVG, a related route72.2%
- BOS to ORD, a related route72.7%
- Delta Air Lines on-time record95.5%
- Republic Airways on-time record82.3%
- Envoy Air on-time record71.8%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. BOS to CVG and CVG to BOS are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.